HCS08 datasheet(106/290 Pages) MOTOROLA

106 / 290 page

Internal Clock Generator (ICG) Module

MC9S08GB/GT

106

MOTOROLA

6.5.3 ICG Status Register 1 (ICGS1)

Figure 6-14 ICG Status Register 1 (ICGS1)

CLKST — Clock Mode Status

The CLKST bits indicate the current clock mode. The CLKST bits don’t update immediately after a

write to the CLKS bits due to internal synchronization between clock domains.

REFST — Reference Clock Status

The REFST bit indicates which clock reference is currently selected by the Reference Select circuit.

1 = Crystal/Resonator selected.

0 = External Clock selected.

LOLS — FLL Loss of Lock Status

The LOLS bit is a sticky indication of FLL lock status.

1 = FLL has unexpectedly lost lock since LOLS was last cleared, LOLRE determines action taken.

0 = FLL has not unexpectedly lost lock since LOLS was last cleared.

LOCK — FLL Lock Status

The LOCK bit indicates whether the FLL has acquired lock. The LOCK bit is cleared in off,

self-clocked, and FLL bypassed modes.

1 = FLL is currently locked.

0 = FLL is currently unlocked.

Bit 7

654321

Bit 0

Read:

CLKST

REFST

LOLS

LOCK

LOCS

ERCS

ICGIF

Write:

Reset:

00000000

= Unimplemented or Reserved

Table 6-10 CLKST Clock Mode Status

CLKST[1:0]

Clock Status

Self-clocked

FLL engaged, internal reference

FLL bypassed, external reference

FLL engaged, external reference

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